题解 | #计算三角形的周长和面积#
计算三角形的周长和面积
http://www.nowcoder.com/practice/109a44d649a142d483314e8a57e2c710
var array = str.split(' ');
var array1 = array.map(Number);
var k = array1[0] + array1[1] + array1[2];
var p = k / 2;
var circumference = k.toFixed(2);
var area = (Math.sqrt(p*(p-array1[0])*(p-array1[1])*(p-array1[2]))).toFixed(2);
console.log('circumference=' + circumference + ' area=' + area);